Improvement in wax-thread sewing-machines



- '3 Sheets--Sheeti. W. H. JOHN-SON.

Wax-Thread Sewing-Machines.

N0, 135,431 Patented Feb. 4,1373.

WITNESSES. INVENTOR.

J mm A -L AM. PHammuos/mPu/cco.ukwsaokuskmactrss) 3 Sheets--Sheet 2 W. HJOHNSON.

Wax-Thread Sewing-Machines.

No, 135,431 Patented Feb.4,1873.

. AM PHD T0-UTHOGRAPHIO 0a MK (mama's mabsss) TJ ITED STATES A'IENTOFFICE.

\VILLIAM H. JOHNSON, OF SPRINGFIELD, MASSACHUSETTS.

IMPROVEMENT IN WAX-THREAD SEWING-MACHINES.

, the needle and itsaccessories, the awl audits accessories, and thefeeding mechanism. My

invention consists in a combination and ar range nent of parts wherebyall the movements of these several parts are derived from a single crankactingthrough two diverging connecting-rods, which are arranged in apeculiar manner to be described, by which the easy reciprocating motionimparted by a crank is attained, and the use of driving-cams is avoided,and at the same time the movements imparted thereby are so modified fromthe simple crank motion by the devices connected therewith as to enablethem to give to the needle, awl, and feeding devices the modifiedmotions required in the machine; and it also consists in several minormodifications of structure, which will be more particularly set forth inthe description of the machine.

In the drawing, Figure l is a side elevation of the machine. Fig. 2 is asectional plan. Fig. 3 is an elevation of the opposite side of themachine. Fig. 4. is a front-end elevation. Fig. 5 is a transversesectional elevation, showing the parallel slides; and Fig. 6 is also atransverse sectional elevation, showing the arrangement of the divergingconnectin g-rods and some other parts.

A is the frame of the machine, not materially unlike in form thewaxthread sewingmachines now in use, except so far as it is modified toreceive my improvements. B is the main driving-shaft, having abalance-wheel, B, as usual, upon the outer end, and upon the inner endthe crank O, which has a crank-pin, C, from which all the movements ofthe machine are derived. D and D are connectingrods, the second one ofwhich, D, for greater convenience, works upon a wrist-pin, fixed in twowrist-pins E and E to be also parallel, 7

but each to be tangent to a circle of which the main shaft is thecenter, but upon opposite sides of the central line of the same. By thisarrangement each slide E E and the mechanism connected'therewith has aseparate movement different in time and relative velocity in differentparts of its movement from the other, the nature of which can be readilycomprehended from an inspection of the drawing. The slide E at its upperend is connected with the end of the balance-lever F, which, at theopposite end, actuates the end of the needle or awl bar K in theu'sualway, and the slide E at its lower end is connected with thebalance-lever G, which, at its other end, works the needle or hook-bar Nalso in the usual way. The bar N works in boxes attached to the plate H,which is made to oscillate a short distance upon the fulcrumpin H tofeed the work along. 0 is the sliding bar, which carries the cast-off O,as usual. L is the sliding rod that carries the presser-foot L, and M isthe rod that carries the thread-guide M.

The general operation of these devices, which manipulate the thread toform the seam, is substantially the same in this machine as in others,and therefore need not be particularly described in setting forth myinvention, except when they are thereby modified.

P is a rocking-shaft, arranged as shown,upon the front end of which is aslotted arm, 1?, which receives an adjustable Wrist-pin, p, which isfixed in the vibrating plate H, and by means of which the oscillationsof the plate and its attachments are produced to feed the materialthrough the machine in a well-known manner. Upon the opposite end of therock ing shaft P is an arm, P which, at its outer end, is jointed to thesliding bar Q, which slides vertically in guides in the piece A, as isseen in Fig. 5. The slide Q has at its 11pper end a long mortise, Q,through it, through which the arm J passes, which is attached to theslide-bar E, and which carries the slide Q up and down a short distance,when it strikes the ends of the mortise Q. The ends of the mortise arepacked with leather to prevent noise. To the outer end of the arm J isattached a rod, J, which extends upward through an eye in the back endof the lever B, and is provided with an adjustable collar, R and aleather washer. The opposite end of the lever B is bent upward at R andbears againstthe under side of the spring S, which holds down thepresser-foot and raises it oii' from the stud T which is fixed to therod L of the presser-foot, as shown. By this means the pressure of thepresser-foot upon the work is relieved at the time of feeding, Withoutthe foot being raised from the work, and avoids the eiiect upon the eyesof the operator that is experienced when the presser-foot is raised atevery stitch. But if it is preferred to raise the presser-foot off ofthe work at each stitch it can be done by sliding the blockU outward andunder the stud T, when the presser-foot will be raised with the lever R.V is a camlever for raising the presser-foot and holding it up.

By the arrangement of mechanism shown both the awl and the hook-needleare passed through the material at the proper times, and when the awl iswithdrawn the needle follows it closely and almost in contact with it,through the same hole. After the awl is drawn out of the material thehook, needle, and awl separate by the peculiar movements imparted by the(rank, diverging connecting-rods, and slides, arranged as has beendescribed, which have the effect to make the limits of the reciprocatingmotions of the awl and hook, respectively, occur at different points inthe revolution, and also to accelerate their motion during one-half ofthe revolution, and retard it during the other half, which brings theseveral operations of the machine to co-operate two systems of mechanismleading therefronr in obliquejor divergent directions, as described.

What I claim is- 1. The combination of the driving-crank, the diagonalconnecting-rod, and the slide, with the lever that works the awl,substantially as described.

2. The combination of the driving-crank, the diagonal connectin g-rod,and the slide, with the lever that works the hook-needle, substan tiallyas described.

3. The combination of the diagonal connecting-rods and the slides thatwork the awl and hook-needle, respectively, set obliquely to each otherand actuated by the same crank, substantially as described.

4. The combination, with the hook-needle, of the rocker-shaft P, or itsequivalent, when. it is actuated by the mechanism that carries the awl,as described, so that it will feed the material along while the hook isin the mate rial, substantially as described. a

5. The combination, with the presser-foot, of the lever B, and spring S,as described, so that the spring will be raised from the presserfootwithout raising the foot, substantially as described.

6. The adjustable block U, in combination with the lever B and the studT, operating substantially as described.

Executed October 14, 1872.

WILLIAM H. JOHNSON. Witnesses:

. T. M. BROWN,

E. M. COATS.

